yes I installed the mailman package by following the perfect server centos6.3 document.

what is crazy is that ispconfig3 does allow me in the panel to create/delete the mailing lists, I can access the admin pages and configure the lists, add moderators and addresses and whatnot, the broken link is between the mailman alias file and postfix. when an email is sent to the list, it is rejected as user unknown.

here is a postfix -n. is there anything blatantly wrong? I see no mention of the mailman alias files therefore question how this can work.